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Proceedings Paper

Electric-field screening in polymer light-emitting diodes
Author(s): Paul A. Lane; John C. De Mello; Robert B. Fletcher; Mark T. Bernius
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Paper Abstract

Electromodulation (EM) spectroscopy has been used to probe the electric field distribution in polymer light-emitting diodes. Below the turn-on bias, the EM spectrum is dominated by electroabsorption of the emissive layer. The electroabsorption signal vanishes at the turn-on bias. Under operation, the EM spectrum is due to excited state absorption from injected charge and bleaching of the ground state absorption of the emissive layer. We conclude that the internal electric field is effectively screened by accumulation of electrons at the anode.

Paper Details

Date Published: 16 February 2004
PDF: 10 pages
Proc. SPIE 5214, Organic Light-Emitting Materials and Devices VII, (16 February 2004); doi: 10.1117/12.521054
Show Author Affiliations
Paul A. Lane, Charles Stark Draper Lab. (United States)
John C. De Mello, Imperial College London (United Kingdom)
Robert B. Fletcher, Dow Chemical Co. (United States)
Mark T. Bernius, Dow Chemical Co. (United States)


Published in SPIE Proceedings Vol. 5214:
Organic Light-Emitting Materials and Devices VII
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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